The SNP leader has faced repeated calls to reveal whether she will propose another independence referendum in her manifesto for the Holyrood election next year, amid unionist concerns that another SNP landslide could be seen as a mandate for a second vote.

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UK Prime Minister David Cameron flatly refused to consider another independence referendum this week, and indicated that any decision by the Scottish Government to unilaterally decide to hold a referendum would not be legitimate.

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Scottish Secretary David Mundell – the only Tory MP in Scotland – said on Monday that he does not believe "it is for the SNP themselves to determine whether the people of Scotland are in favour of having another referendum".

But Sturgeon, who was addressing the Hong Kong Foreign Correspondents' Club this morning as part of her visit to Asia, said: "Two questions I get asked often these days - will there be another independence referendum and, if so, when?